FRENCH OPEN tennis player Jack Sock was furious with the chair umpire during his defeat against Jurgen Zopp yesterday.

Sock slumped to a five set defeat to Estonian Zopp on Tuesday but the American also found himself competing with the match’s chair umpire at times.

The 25-year-old lost 6-7, 6-2, 4-6, 7-6, 6-3 but throughout the match, the No 14 seed was seen trading insults with umpire Paula Vieira Sousa after becoming unhappy with a number of calls.

At one point, Vieira Sousa was seen showing Sock where a ball hit, however he became increasingly frustrated with her call, repeating that the ball “was not close to the line” while he stood feet from her.

Later on during the match, Vieira Sousa stopped play to check on a ruling, however, Sock became annoyed again and turned away saying “that makes no sense”.

Jack Sock was furious with the chair umpire during his French Open 2018 defeat (Image: FRENCH OPEN)

Sock had a number of exchanges with the chair umpire during the match (Image: FRENCH OPEN)

The incident came to a head when Sock asked for a new umpire for the match.

Sock: “If I could request a new one, I would. Shocking stuff. Could I request a new ref?”

Vieira Sousa: “For what?”

Sock: “For you. You're atrocious.”

Staggeringly, Sock was not apologetic about his on court behaviour.

When asked if he regretted his behaviour or outbursts, Sock replied: “If she does her job, then I wouldn't have to do that.”